Meiotic Resumption
Mostrando 1-12 de 19 artigos, teses e dissertações.
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1. Supplemented powdered coconut water (ACP-406®) promotes growth of goat secondary follicles and oocyte meiotic resumption
Abstract The objective of this study was to test the efficiency of powdered coconut water (ACP-406®) base-medium without or with the addition of supplements on in vitro culture of isolated goat secondary follicles. Follicles were cultured for 18 days in α-MEM or in ACP-406®, both without supplements (referred to as α-MEM and ACP, respectively), or both s
Anim. Reprod.. Publicado em: 25/11/2019
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2. OS PROCESSOS DE OVULAÇÃO E REINÍCIO DA MEIOSE OOCITÁRIA SÃO MEDIADOS PELA INTERAÇÃO ENTRE ANGIOTENSINA II, PROGESTERONA E PROSTAGLANDINAS / THE OVULATORY AND MEIOTIC RESUMPTION PROCESSES ARE MEDIATED BY THE INTERACTION AMONG ANGIOTENSIN II, PROGESTERONE AND PROSTAGLANDINS
A angiotensina II (AngII), progesterona (P4) e prostaglandinas (PGs) são fatores essenciais para que ocorra a ovulação de um oócito fértil. Este trabalho buscou entender se esses fatores interagem durante o processo de ovulação e maturação oocitária. Para tanto, primeiramente caracterizamos a expressão de genes de interesse para o sistema renina a
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 28/02/2011
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3. Efeito de Diferentes Concentrações de Oxigênio Sobre o Cultivo In Vitro de Folículos Pré-Antrais Caprinos. / Effect of Different Concentrations of Oxygen About In Vitro Cultivation of primordial follicles Goats.
The aim of the present study was to evaluate the effect of two different oxygen (O2) concentrations on the survival and development of goat preantral follicles cultured in vitro. Preantral ovarian follicles (150 μm) were isolated from ovarian cortex fragments and individually cultured for 30 days under two different O2 concentrations (5% and 20%). Folli
IBICT - Instituto Brasileiro de Informação em Ciência e Tecnologia. Publicado em: 07/12/2009
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4. MODULATION OF MEIOTIC RESUMPTION OF BOVINE OOCYTES BY FIBROBLAST GROWTH FACTOR 10, ANGIOTENSIN II AND PROGESTERONE IN AN ALTERNATIVE CULTURE SYSTEM / MODULAÇÃO DO REINÍCIO DA MEIOSE DE OÓCITOS BOVINOS PELO FATOR DE CRESCIMENTO FIBROBLÁSTICO 10, ANGIOTENSINA II E PROGESTERONA EM SISTEMA ALTERNATIVO DE CULTIVO
O presente trabalho teve por objetivo averiguar o papel do fator de crescimento fibroblástico 10 (FGF10) no reinício da meiose de oócitos bovinos, utilizando um modelo in vitro de co-cultivo de oócitos e células foliculares. Em um primeiro estudo, foi estabelecido um sistema de cultivo capaz de manter a osmolalidade dos meios constante na ausência de �
Publicado em: 2009
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5. RT-PCR QUANTITATIVO EM TEMPO REAL PARA ANÁLISE DO RECEPTOR DE EGF EM COMPLEXOS CUMULUS-OÓCITO COLHIDOS POR LAPAROSCOPIA EM CABRAS CANINDÉ SUBMETIDAS À ESTIMULAÇÃO HORMONAL OVARIANA
Ovarian stimulation with exogenous Follicle Stimulating Hormone (FSH) has been used to increase the number of viable oocytes for laparoscopic oocyte recovery (LOR) in goats. The aim of this study was to evaluate the effect of two FSH protocols for ovarian stimulation in goats on the expression pattern of EGF receptor (EGFR) in cumulus-oocyte complexes (COCs)
Publicado em: 2009
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6. Reducing CYP51 inhibits follicle-stimulating hormone induced resumption of mouse oocyte meiosis in vitro
Meiosis activating sterol, produced directly by lanosterol 14-α-demethylase (CYP51) during cholesterol biosynthesis, has been shown to promote the initiation of oocyte meiosis. However, the physiological significance of CYP51 action on oocyte meiosis in response to gonadotrophins’ induction remained to be further explored. Herein, we analyzed the role of
The American Society for Biochemistry and Molecular Biology.
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7. Somatic cAMP signaling regulates MSP-dependent oocyte growth and meiotic maturation in C. elegans
Soma-germline interactions control fertility at many levels, including stem cell proliferation, meiosis and gametogenesis, yet the nature of these fundamental signaling mechanisms and their potential evolutionary conservation are incompletely understood. In C. elegans, a sperm-sensing mechanism regulates oocyte meiotic maturation and ovulation, tightly c
Company of Biologists.
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8. Nutritional regulation of late meiotic events in Saccharomyces cerevisiae through a pathway distinct from initiation.
The IME1 gene is essential for initiation of meiosis in the yeast Saccharomyces cerevisiae, although it is not required for growth. Here we report that in stationary-phase cultures containing low concentration of glucose, cells overexpressing IME1 undergo the early meiotic events, including DNA replication, commitment to recombination, and synaptonemal compl
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9. Cyclic nucleotide phosphodiesterase 3A–deficient mice as a model of female infertility
Since cAMP blocks meiotic maturation of mammalian and amphibian oocytes in vitro and cyclic nucleotide phosphodiesterase 3A (PDE3A) is primarily responsible for oocyte cAMP hydrolysis, we generated PDE3A-deficient mice by homologous recombination. The Pde3a–/– females were viable and ovulated a normal number of oocytes but were completely infertile, beca
American Society for Clinical Investigation.
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10. Activated alpha subunit of Go protein induces oocyte maturation.
The capability of various activated guanine nucleotide binding regulatory protein (G protein) alpha subunits to induce meiotic maturation was studied. Activated Go protein alpha subunit (alpha o*) but not the three inhibitory G protein alpha subunits triggered meiotic maturation in Xenopus oocytes. The effect was concentration dependent with a half-maximal e
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11. XGef Mediates Early CPEB Phosphorylation during Xenopus Oocyte Meiotic Maturation
Polyadenylation-induced translation is an important regulatory mechanism during metazoan development. During Xenopus oocyte meiotic progression, polyadenylation-induced translation is regulated by CPEB, which is activated by phosphorylation. XGef, a guanine exchange factor, is a CPEB-interacting protein involved in the early steps of progesterone-stimulated
The American Society for Cell Biology.
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12. Cyclic GMP from the surrounding somatic cells regulates cyclic AMP and meiosis in the mouse oocyte
Mammalian oocytes are arrested in meiotic prophase by an inhibitory signal from the surrounding somatic cells in the ovarian follicle. In response to luteinizing hormone (LH), which binds to receptors on the somatic cells, the oocyte proceeds to second metaphase, where it can be fertilized. Here we investigate how the somatic cells regulate the prophase-
Company of Biologists.